This is a Jedi duel of the original trilogy.https://www.youtube.com/watch?v=U1MnMA0TzGI
Please consider the "lightsaber as a throwing weapon" act, fairly simple to do.
It had enough push to cut through rather thick steel beams.https://youtu.be/lsAEdblcqU4?t=86
This is another duel, where a padawan (not even a full knight, though I agree he was at the end of his training) use the force to pick up a lightsaber from afar, catch it in mid jump and use it offensively again, all in 15 seconds.
Now, imagine this little combo of "I throw my lightsaber at the packed formation of pikemen "knights" and then call it back"
And now remember the Jedis only have to kill 20 or so pikemen each to make the trick a worthy tactic.
The very first volley of thrown lightsabers would kill / maim / wound hundreds of knights and severly disturb (and slow down) their formation.
Now, all those lightsabers are still active when on the ground.
So we could imagine them being pull back by staying close to the ground, just to slice a few hundred ankles on top of the initial casualties.
But let's say our good jedis don't want to risk their lightsabers being stuck for some reasons so they just switch them off and pull them back in the easiest, straightforward way possible.
That's still hundreds of knights neutralized every 15-30 seconds.
And the Jedi can step back, without the need to engage in a bloody melee.
After five minutes or so of playing "throw and catch" with their lightsabers, the jedis decide that having killed or maimed 1000 knights is good enough so they offer peace.
The knights refuse and win an additionnal 10 minutes of the exact same treatment.
After enduring 10 minutes of being bombarded by rods of burning plasma, there's about half of the knights still on their feet.
Again, they are offered peace and again they refuse.
The Jedi now feel like being cocky so they decide to play serious.
They extend their line as much as possible.